Threading tool



Nov. 3, 1931. N. OESTREICH THREADING TOOL 2 "Sheets-Sheet 1 Filed Feb. s, 1930 nez FIG. 3

n M M a Q g Q 8 Y R v E o m m n 0 E m n w w A y Y Y B 22833. .53 :33 =2... g G s w 325. 2 M n 79F :5 53 .5 2620 Wm M c 1 F I Linamar can SEGMENT l atented: Nov. 3, FY 1931 nonirenlonsrnnlcn; on MILWAUKEE, ,WISC'CNSIN mnnnamue TOOL Application filed. February 3, 193a; s m in, 425,446.

'My"invention relates to that class oftools' esigned'tocut a:plurality ofthreads at a me. f 1 My invention has for its object, to construct tool which will cut all of the threads on a ipe, for example, in a single revolution of 1e plpe.

My. inventionhas for its further object, to

) arrange the'cutting tools that each one 'ill out only one-twelfth of the depth of the ireadxj" j A concrete device embodyingjmy'inven- 011,; is illustrated in the accompanying rawings which are to be considered as'a artofthis specificatiomin whichf Fig. lis a view, partly in section, of one f my improved cutters, cutting the threads p nw a Fig. 2 is a view'of a bar having a series of nnular grooves cut inits'c'enter; r

Fig. 3 'isra similar view, ith a helical ea a v 1 Fig/iris a diagram of the cam .travel for adial, movement of the cutters; f Fig. 5 is afldiagram; illustrating the rela-j ion offcam and chuck travel to obtain s'imul-,

aneous movement of the cutters hroughout complete revolution of thechuck; and

TFigsLG and 7 are'diagrams 'ofthepaths of ravel'of a, series of twelve cutting tools" in he generation of the threads ona pipe. In hese figures there'are illustrated by 12 conentric lines the travel of. the twelve tools,

ach subdivision indicatingthejtotal amount f cutting of the tools at one time during tstravel. This is shown at the outside circle n Fig. 6 and the inside in Fig. 7, the dotted ine in 7 showing the complete line. of ravel of a single tool but as .isclearly apmrentfrom this figureat notime is; a tool xutting more than the amount indicated by he space between oneof the sub-divisions.

Similar. reference" numerals" referto simiar parts, throughout the entire description.

As shown in the drawings, myinvention :onsists of a housing A'having an axiallyexending flange B, a series ot' cutters, num- )GIGd. 1 to 12, which are slidably mounted in chuck 16. Each cutter has as many teeth 13 :ut on itsinner end as it is desired to cutin a single revolution of the rod or pipe to be threaded, 'for it will be obvious that mytool can be used for threading bolts, rods or pipes,

as desired. I I

Rollers 14 are secured'to each of the cutters, in any suitable manner. These rollers 14 are mounted in a cam groove '15, so that its rotation will move the cutters radially.

' As shown in the cam diagram, Fig. 4;, there are twelve cam segments, therefore the complete cam cycle is accomplished by a relative motion of one-twelfth circumference (i. e. 30) between the cam and chuck. 'It'takes one revolution of the chuck 16 to obtain this relative motion of the cam 15, therefore the twelve cam segments function simultane ouslv and produce, the predetermined cam travel for the twelve cutters 1 to 12 during the single revolution. f

' The pipe thread is produced by the rota= tion of the pipe in counter-clockwise "direction, while the cam and chuck travelin the opposite direction. As the cam 15rotates it moves the cutters radially, as clearly shown I in Fig. 4. The work'or the tool ismoved longitudinally distance equal to the pitch of the. thread tobe cut,"1during each revol'u tion theltools' reaching the full depth of the threadfThe-finish of one groove enters the place of origin of the preceding groove'fl-In this manner I am able to produce a standard pipe thread in a'singlerevolution. v

" The speed of the cam" 15 in, degrees is eleven-twelfths of the speed of the chuck 16. The cam-15 turns 830 while the chuck 16 is turning '36.0. This 30 difference constitutes' the relative motion of the cam15. It will thus be, seen that the relative difference of. the travel of the cam 15 determines the rate ofiradial travel of the cutters for a given circumferential rotationf This "may be fva'riedby suitable gear trains (not shown) toaccommodate varying conditions of operation. Obviously, the les'sdifi'erence there is in the relativerotation, the slower the radial 9 movement of the cutters, and as a resultant 'mor'e revolutions will be required.-

In the diagrammatic views, Figs. 6 and 7 is clearly traced the line or path of travel of each of the cutters from 1-to 12, and it is thus demonstrated that no cutter is called upon to cut more than one-twelfth of the depth of the p groove in the thread being out, regardless of the pitch. 7 v It will be apparent, to persons skilled in the art, thatwith this tool it is easily possible to out. threads on any portion of a rod or pipe, as: shown in Fig. v3,: or a series of simple grooves, such asshown in Fig. 2, and

than is possible in a lathe, or-even in ascrew machine.

Having described my invention, whatI ree gard as new, and desire to secure by Letters Patent of the United States, is z" 1.- In a device of the: character described,

ail-annular rotary chuck, a housing rotatable at a'd iiierent speed than the chuck enclosing said chuck provided with an inwardly projectin-g annular flange, said flange being proj videdu with an annular groove formed with a plurality of'cam' faces, a plurality of cutters which areprovided with projections adapted to be: received and. actuated by said cams, said cutters; havingthe desirednumb-er of teeth corresponding with the number of threads desired to be cut, the camsbeing so formed as to gradually feedsaid cutters intothe work until thedesired depth is obtained and then maintain the cutters in that position for a portion of. a revolution of the chuck when the cutters are withdrawn completing the thread v anannular rotary chuck, a housing rotatable in one revolution of the chuck relative to the work to be threaded. 2. In a device of the character described,

7 at adifferent speed than the chuck; enclosing said chuck provided with an inwardly proecting annular fiange,'sa1d flange being provided with an annular groove formedv with twelvecamfaces, twelvecutters which are provided with projections adapted to be received andactuated by said cams, said outters having. the desired number of teeth corresponding with the number-of threads desiredto be cut, the cams being so formed as re. gradually feed. said cutters into the work until thejdesired depth is obtained and then maintain the cutters in" that position for a portion of a revolution of the. chuckwhen the cutters arewithdrawn completing the thread in one revolution of thechuck relative to the work to" be threaded.

3; In a device of the character describe an annular rotary chuck,:a housing rotatable at a difl'erent'speed than the chuck enclosing said chuck provided with an inwardly projecting annular flange, said flange being provided withan annular groove formed with a plurality of cam faces,a plurality of cutters which are'providedwith projections, rollers on said projections adapted to be received and actuated bys-aid cams, said cutters having the I jdesired numberoif teeth corresponding with the number ofthreads desired. to'bje cut, the

that they can be out very much more rapidly cams being so formed as to, gradually fee said cutters into the work until the desire depth is obtained and then maintain the on ters in that position for a portion of a revoli tionof the chuckwhen the cutters are witl. drawn completing the thread in one revoli tion of. the chuck relative to the work to t threaded. i

J l. In a device of the character described, a annular rotary chuck, a housing rotatable; a' difierent speed than the chuck enclosin said chuck provided withan inwardly pr I jecting annular flange, said flange being p1( vided with an annularv groove formed with plurality oi'cani faces, a plurality of cuttei which are provided with projections adapte to be received and actuated by said cams, sai cutters having the desired number of teetcorresponding with the number of thread desired to be cut, the camsbeing so formed a to gradually and simultaneously ieed' sai cutters into the work until the desired dept isobtained and then maintain the cutters i that position for a portion of a revolution 0 the chuck when the cutters are withdraw provided with'projections adapted to be re ceived and actuated by said can ne, said cutter having the desirednumber of teeth corrc spondingwith the -number of threads desire to be cut, the cams being so formed ast gradually and simultaneously feed said out .ters into the work until the desired depth i obtained and then maintainthe cutters ii that position for a portion of il-l'GVOlHtlOn o the chuck whenthe cutters are withdraw:

completing the thread in one revolution 0 the chuck relative to the work to be threaded V NORMAN OESTREICH. 

